Okay kiddo, so there was this time in China called the Three Kingdoms period. It happened a long, long time ago, like way before mommy and daddy were born.
During this time, there were three groups of people who were fighting for power. They were called the Wei, the Shu, and the Wu. Think of them like three different teams in a big game of capture the flag.
Each group had their own leaders who wanted to be in charge of everything. They had big armies with lots of soldiers who would fight against each other.
There were many battles throughout the Three Kingdoms period, with each team trying to defeat the other two. The soldiers in each army were very brave and fought very hard, but sometimes they would get hurt or even die during the battles.
Some of the most famous leaders during this time were Cao Cao, Liu Bei, and Sun Quan. They were very smart and strong leaders who made important decisions for their teams.
At the end of the Three Kingdoms period, one team ended up winning and gaining control over all of China. It was the Wei team, led by a man named Sima Yan.
So, that's the story of the military history of the Three Kingdoms. It was a time when people fought for power and there were many battles. But in the end, one team emerged victorious and became the leaders of China.